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In 1994, 2 long range tracer experiments over a distance of 1800 km were executed in Europe. Twenty-four institutions took part in the real-time forecasting of the cloud evolution, with 28 long range dispersion models. The experiments showed that it is possible to alert National Meteorological Services at short notice and that the forecast for up to 60 hrs of the evolution of the cloud can be obtained by decision makers within a period of a few hours after alert. The quantitative evaluation of the forecasted concentrations led to the conclusion that there is a large number of models which gave satisfying results. These models predicted the area enclosed by an isoline of concentration at the correction location and the right size.

Additional information

Authors: GRAZIANI G, JRC Ispra (IT);GIRARDI F, JRC Ispra (IT);NODOP K, JRC Ispra (IT);KLUG W, Meteorology Institute Darmstadt (DE)
Bibliographic Reference: Paper presented: Sixth Topical Meeting on Emergency Preparedness and Response, San Francisco (US), April 22-25, 1997
Availability: Available from (1) as Paper EN 40366 ORA
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